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Finding the Fourth Proportional to 389,843.60, 584,765.40 and 386,157.20

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Solution

The fourth proportional to 389,843.60, 584,765.40 and 386,157.20 is: 579,235.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,843.60 : 584,765.40 = 386,157.20 : x
  2. Step 2: Convert to fraction form
    389,843.60/584,765.40 = 386,157.20/x
  3. Step 3: Cross multiply
    389,843.60x = 584,765.40 × 386,157.20
  4. Step 4: Simplify right side
    389,843.60x = 225,811,369,520.88
  5. Step 5: Solve for x
    x = 225,811,369,520.88/389,843.60
  6. Step 6: Final answer
    x = 579,235.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.